Improvement in window sashes and frames



DONALD MACKAY, OF CHICAGO, lLLINOIS.

IMPROVEMENT IN WINDOW SASHES AND FRAMES.

Specification forming part of Letters Patent No. 140,783, dated July 15,1873 application filed May 5, 1873.

To all whom "it may concern:

Be it known that I, DONALD MAOKAY, of Chicago, in the county of Cook andState of Illinois, have invented a certain new, useful, and ImprovedWindow Sash and Frame, of which the followin g is a full, clear, andexact description which will enable others skilled in the art to whichmy invention appertains to make and use the same, reference being hadtothe accompanying drawing forming a part of this specification, and inwhich I Figure l is a vertical central section of my improved windowsash and frame; and Fig. 2, a horizontal section of the same in theplane of the line so a", of Fig. 1, the upper part of the sash beinglowered.

Like letters of reference indicate like parts.

The object of my invention is to make the window-sash and its frame insucha manner that weather-strips need not be employed, and so that wind,dust, rain, &c., cannot enter the window when the sash is closed; and tothat end my invention consists in certain novel features, hereinafterparticularly described and set forth, relating to the construction ofthe sash, and of the window-frame.

In the drawing, A and A represent the sash, and B is the frame in whichthe sash is arranged. C is the window-sill, which rises in two stepsfrom its outer to its inner face, as shown in Fig. 1.' c c are groovessunken longitudinally along the base of each step or ridge on the sill.The upper face of the sill, excepting that part which is interior to thesash, is inclined downward and outward, and the outer face of the upperor inner step is beveled, in the manner shown. D D are removable centralribs, each made in two parts corresponding in length to the length ofthe upper andlower sash, respectively, and arranged in vertical groovessunken into the window-frame. That part of the ribs D D against whichthe lower sash rests, when closed, has a longitudinal groove, a, sunkenin its inner face, and is soarranged that the bottom of the groove willbe flush with the inner face of the upper part of said ribs, as shown inFig. 2. The outer face of the upper part of the ribs D D is also groovedlongitudinally, as shown at a. a, and the bottom of these grooves isflush with the outer face of the lower parts of the ribs D D. The sashrides on the ribs D D, and its upper and lower parts are separated bythem, and are retained in the window-frame in the usual manner. Thelower bar of the sash A is constructed to match that part of the sillupon which it rests, and is provided with the strip 1) set into itsouter lower edge, and also matching the sill, as shown. The outervertical edges of the sash A are provided with ribs, which ride in thegrooves a a, and the sash A is provided with like ribs arranged to ridein the grooves a a. The upper cross-bar of the sash A is provided with arib, c, which sits into a corresponding groove in the frame B, as shown.The inner face of the lower cross-bar of the sash A, and the outer faceof the upper crossbar of the sash A, are beveled and matched together inthe manner shown in Fig. 1. All the moving parts are constructed to fitthe fixed parts as closely as possible without creating too greatfriction, and the removable ribs D D should be nicely fitted into theirgrooves.

It willbe perceived from the foregoing description, and from referenceto the drawing, that rain, dust, &c., cannot enter a room through a sashand frame constructed in the manner specified without being turned fromits course many times at each point at which it strives to enter, andthat the matter, if any, which is driven between the sash and the framewill there remain and form a barrier to the entrance of other matter.Especially is this result produced by the grooves c c, which arearranged at the point of greatest exposure, and they will tend to turnback water lodging on the sill and driven toward the sash by the wind.

I deem it preferable to make the grooves of the lower half of the ribs DD terminate just above the lower end of the said ribs, and to make thelower bar of the upper sash so as to close the lower end of the groovesa, and cover the lower end of the outer rib formed by said groove. 7

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

The grooved window-frame B, provided with the beveled and grooved sill0, and with the removable and grooved separating-ribs D D arranged inthe vertical grooves of the frame B, in combination with a double sash,each part of which is constructed to match the other, and provided withvertical ribs arranged to ride in the grooves of the ribs D D, the lowersash being also constructed to match the sill, and the upper one tomatch the top of the window-frame, substantially as and for the purposesspecified.

DONALD MAOKAY. Witnesses:

N. O. GRIDLEY, Jim. W. ROBERTS.

